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【单选题】
下列说法错误的是( )A.
纯物质在一定压力下有恒定的沸点。
B.
液体的沸点是指在标准状态下，即大气压力为101.325kPa时液体沸腾时的温度，用Tbp表示。
C.
有恒定沸点的物质一定是纯物质。
D.
当液体的蒸汽压与大气压力相等时，会沸腾。
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举一反三
【单选题】Where could she ______ the key? I couldn't find anywhere.
A.
put
B.
have put
C.
has put
D.
had put
【单选题】Helen asked her father _____. [ ]
A.
if it was a balloon in the sky
B.
where could she get this kind of book
C.
that he would show her around the farm
D.
if they will have fish for lunch
【简答题】She had got to the point where she felt that she could not take any more.
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